I was messing around trying to get split screen to work online so I could play with my two friends who share a computer, and wound up somehow screwing up the first person aiming perspective. The camera is MUCH too close to the weapons models. Showing only the guns themselves, no hands. And for the first aid kit I can only see the top left corner. Anyone have any idea what's going on?

You've messed the viewmodel size up. Enable the developer console, open it up and type "cl_viewmodelfovsurvivor XX" without quotes, where XX is your desired number. I believe the default is 50, higher numbers will let you see more of your arms and weapons, lower numbers will make you see less.